Dockerfile.proxy

# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# HTTP/JSON proxy in front of the Rebalancer Explorer Thrift service.
#
# External callers POST /v2/<method> with a JSON body; the proxy transcodes
# JSON <-> Thrift and forwards each call to a single configured Explorer
# backend over fbthrift/Rocket.
#
# This image reuses the rebalancer-explorer runtime image, which already bundles
# the `rebalancer_explorer_proxy` binary (built by CMakeLists.txt under
# REBALANCER_BUILD_EXPLORER). It only changes the exposed port and entrypoint.
#
# Build the shared build image, then the explorer, then this one:
#   docker build -f Dockerfile.base     -t rebalancer-build .
#   docker build -f Dockerfile.explorer -t rebalancer-explorer .
#   docker build -f Dockerfile.proxy    -t rebalancer-explorer-proxy .
#
# Run it (auth required by default; pass a token via the env var):
#   docker run --rm -p 8081:8081 \
#     -e REBALANCER_PROXY_AUTH_TOKEN="$(openssl rand -hex 32)" \
#     rebalancer-explorer-proxy --backend_host=<host> --backend_port=8080

FROM rebalancer-explorer

# Default proxy port. Forwards to the Explorer backend at 127.0.0.1:8080 unless
# overridden via --backend_host / --backend_port.
EXPOSE 8081

ENTRYPOINT ["/usr/local/bin/rebalancer_explorer_proxy"]
CMD ["--port", "8081"]